This isn't a Marbleduck forum, it is the Symthic forum. You can ask for advice here without specifically seeking out one person who does not often visit the forums in the first place. Also, you may be able to answer your own questions regarding weapon setups by using our weapon charts. The FAMAS page can be found here.

Despite not being Marble I would suggest using the compensator to counter the horizontal recoil and to use the ergo with a laser sight to really emphasise on what this weapon does best and play accordingly. You have a bullpup weapon with a high firerate, increased ADS moving speed and good hipfire with only 26 bullets. Kill fast but think about engagements.

Why you would only want to use it on burst is beyond me, but you could make a case for the angled grip then, which does not hurt your full-auto capabilities too much, but might help in longer engagements.

With the FAMAS in conclusion it is most important to play smart and fast to make use of the really low TTK. Also always leave a round in the chamber since the tactical reload is acceptable, while the full reload is so mich longer.